package cpw.mods.fml.common.network;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import java.util.EnumMap;
import net.minecraft.client.network.NetHandlerPlayClient;
import net.minecraft.entity.player.EntityPlayerMP;
import net.minecraft.network.NetHandlerPlayServer;
import cpw.mods.fml.common.FMLCommonHandler;
import cpw.mods.fml.common.eventhandler.EventBus;
import cpw.mods.fml.common.eventhandler.SubscribeEvent;
import cpw.mods.fml.common.network.internal.FMLProxyPacket;
import cpw.mods.fml.relauncher.Side;
/**
* An event driven network channel, using {@link FMLNetworkEvent.CustomPacketEvent} and {@link FMLNetworkEvent.CustomNetworkEvent}
* to deliver messages to an event listener. There is one "bus" for each channel, due to the
* impossibility of filtering a bus for specific events.
*
* This event driven system completely wraps the netty code. Mod code deals with FMLProxyPackets directly. It is not
* possible to enhance the netty pipeline, and I would expect highly unexpected results if it were modified reflectively.
* Use a real ChannelHandler if you want to use netty.
*
* @author cpw
*
*/
public class FMLEventChannel {
private EnumMap<Side, FMLEmbeddedChannel> channels;
private EventBus eventBus;
/*
* This is done this way so that the CLIENT specific code in the factory only loads on the client
*/
private enum EventFactory
{
SERVER()
{
@Override
FMLNetworkEvent.CustomPacketEvent<?> make(FMLProxyPacket msg)
{
FMLNetworkEvent.CustomPacketEvent<?> event = null;
if (msg.handler() instanceof NetHandlerPlayServer)
{
NetHandlerPlayServer server = (NetHandlerPlayServer) msg.handler();
event = new FMLNetworkEvent.ServerCustomPacketEvent(server.func_147362_b(), msg);
}
return event;
}
},
CLIENT()
{
@Override
FMLNetworkEvent.CustomPacketEvent<?> make(FMLProxyPacket msg)
{
FMLNetworkEvent.CustomPacketEvent<?> event = null;
if (msg.handler() instanceof NetHandlerPlayClient)
{
NetHandlerPlayClient client = (NetHandlerPlayClient) msg.handler();
event = new FMLNetworkEvent.ClientCustomPacketEvent(client.getNetworkManager(), msg);
}
else if (msg.handler() instanceof NetHandlerPlayServer)
{
NetHandlerPlayServer server = (NetHandlerPlayServer) msg.handler();
event = new FMLNetworkEvent.ServerCustomPacketEvent(server.func_147362_b(), msg);
}
return event;
}
};
abstract FMLNetworkEvent.CustomPacketEvent<?> make(FMLProxyPacket msg);
}
private static EventFactory factory = FMLCommonHandler.instance().getSide() == Side.CLIENT ? EventFactory.CLIENT : EventFactory.SERVER;
FMLEventChannel(String name)
{
this.channels = NetworkRegistry.INSTANCE.newChannel(name, new NetworkEventFiringHandler(this));
this.eventBus = new EventBus();
}
/**
* Register an event listener with this channel and bus. See {@link SubscribeEvent}
*
* @param object
*/
public void register(Object object)
{
this.eventBus.register(object);
}
/**
* Unregister an event listener from the bus.
* @param object
*/
public void unregister(Object object)
{
this.eventBus.unregister(object);
}
void fireRead(FMLProxyPacket msg, ChannelHandlerContext ctx)
{
FMLNetworkEvent.CustomPacketEvent<?> event = factory.make(msg);
if (event != null)
{
this.eventBus.post(event);
if (event.reply != null)
{
ctx.channel().attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.REPLY);
ctx.writeAndFlush(event.reply).addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
}
}
}
public void fireUserEvent(Object evt, ChannelHandlerContext ctx)
{
FMLNetworkEvent.CustomNetworkEvent event = new FMLNetworkEvent.CustomNetworkEvent(evt);
this.eventBus.post(event);
}
/**
* Send a packet to all on the server
*
* @param pkt
*/
public void sendToAll(FMLProxyPacket pkt)
{
channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.ALL);
channels.get(Side.SERVER).writeAndFlush(pkt).addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
}
/**
* Send to a specific player
*
* @param pkt
* @param player
*/
public void sendTo(FMLProxyPacket pkt, EntityPlayerMP player)
{
channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.PLAYER);
channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGETARGS).set(player);
channels.get(Side.SERVER).writeAndFlush(pkt).addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
}
/**
* Send to all around a point
* @param pkt
* @param point
*/
public void sendToAllAround(FMLProxyPacket pkt, NetworkRegistry.TargetPoint point)
{
channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.ALLAROUNDPOINT);
channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGETARGS).set(point);
channels.get(Side.SERVER).writeAndFlush(pkt).addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
}
/**
* Send to all in a dimension
* @param pkt
* @param dimensionId
*/
public void sendToDimension(FMLProxyPacket pkt, int dimensionId)
{
channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.DIMENSION);
channels.get(Side.SERVER).attr(FMLOutboundHandler.FML_MESSAGETARGETARGS).set(dimensionId);
channels.get(Side.SERVER).writeAndFlush(pkt).addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
}
/**
* Send to the server
* @param pkt
*/
public void sendToServer(FMLProxyPacket pkt)
{
channels.get(Side.CLIENT).attr(FMLOutboundHandler.FML_MESSAGETARGET).set(FMLOutboundHandler.OutboundTarget.TOSERVER);
channels.get(Side.CLIENT).writeAndFlush(pkt).addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
}
}